Update! I tried going to Netflix's support page to post this issue as well and it wanted me to log in. I figured it wouldn't work but tried to log in anyways and the warning doesn't show up on their login page for their support area. So now I am logged in. Seems like this might be a netflix issue with their site.

Serihon said

Seems like this might be a netflix issue with their site.

'Think you're right, cause in Firefox JavaScript is enabled by default.

To make absolutely sure :

Type in the address bar about:config and press Enter (promise to be careful, if asked)

Type in the search bar and look for the preference :

javascript.enabled

Its value should be set to true.

In the unlikely case that you had to change the value : close and restart Firefox.